package cn.jbooter.coms.utils;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
/**
 * 生成验证码
 * @author YXS
 *
 */
public class CaptchaUtil {
	// 图片的宽度。  
    private int width = 160;  
    // 图片的高度。  
    private int height = 40;  
    // 验证码字符个数  
    private int codeCount = 4;  
    // 验证码干扰线数  
    private int lineCount = 150;  
    // 验证码  
    private String code = null;  
    // 验证码图片Buffer  
    private BufferedImage buffImg=null;  
  
    private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'H', 'I', 'J',  
            'K', 'L', 'M', 'N',  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',  
            'X', 'Y', 'Z',  '1', '2', '3', '4', '5', '6', '7', '8', '9' };  
  
    public  CaptchaUtil() {  
        this.createCode();  
    }  
  
    /** 
     *  
     * @param width 图片宽 
     * @param height 图片高 
     */  
    public  CaptchaUtil(int width,int height) {  
        this.width=width;  
        this.height=height;  
        this.createCode();  
    }  
    /** 
     *  
     * @param width 图片宽 
     * @param height 图片高 
     * @param codeCount 字符个数 
     * @param lineCount 干扰线条数 
     */  
    public  CaptchaUtil(int width,int height,int codeCount,int lineCount) {  
        this.width=width;  
        this.height=height;  
        this.codeCount=codeCount;  
        this.lineCount=lineCount;  
        this.createCode();  
    }  
      
    public void createCode() {  
        int x = 0,fontHeight=0,codeY=0,si = 0;  
        int red = 0, green = 0, blue = 0;  
          
        x = width / (codeCount + 1);//每个字符的宽度  
        fontHeight = height - 2;//字体的高度  
        codeY = height - 4;  
        si = (width - x*codeCount - codeCount + 1)/2;
        
        // 图像buffer  
        buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);  
        Graphics2D g = buffImg.createGraphics();  
        // 生成随机数  
        Random random = new Random();  
        // 将图像填充为白色  
        g.setColor(Color.WHITE);  
        g.fillRect(0, 0, width, height);  
        // 创建字体  
        Font font = new Font("Arial",Font.PLAIN, fontHeight);   
        g.setFont(font);  
          
        for (int i = 0; i < lineCount; i++) {  
            int xs = random.nextInt(width);  
            int ys = random.nextInt(height);  
            int xe = xs+random.nextInt(width/8);  
            int ye = ys+random.nextInt(height/8);  
            red = random.nextInt(255);  
            green = random.nextInt(255);  
            blue = random.nextInt(255);  
            g.setColor(new Color(red, green, blue));  
            g.drawLine(xs, ys, xe, ye);  
        }  
          
        // randomCode记录随机产生的验证码  
        StringBuffer randomCode = new StringBuffer();  
        // 随机产生codeCount个字符的验证码。  
        for (int i = 0; i < codeCount; i++) {
        	if(i != 0){
        		String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
        		// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。  
                red = random.nextInt(255);  
                green = random.nextInt(255);  
                blue = random.nextInt(255);  
                g.setColor(new Color(red, green, blue));  
                g.drawString(strRand, ((i + 1) * x) - si - (i + 1), codeY);  
                // 将产生的四个随机数组合在一起。  
                randomCode.append(strRand);  
        	}else{
        		String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
        		// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。  
                red = random.nextInt(255);  
                green = random.nextInt(255);  
                blue = random.nextInt(255);  
                g.setColor(new Color(red, green, blue));  
                g.drawString(strRand, si , codeY);  
                // 将产生的四个随机数组合在一起。  
                randomCode.append(strRand);  
        		
        	}
        }  
        // 将四位数字的验证码保存到Session中。  
        code=randomCode.toString();       
    }  
      
    public void write(String path) throws IOException {  
        OutputStream sos = new FileOutputStream(path);  
        this.write(sos);  
    }  
      
    public void write(OutputStream sos) throws IOException {  
        ImageIO.write(buffImg, "png", sos);  
        sos.close();  
    }  
    public BufferedImage getBuffImg() {  
        return buffImg;  
    }  
      
    public String getCode() {  
        return code;  
    }  
}
